A hard nut to crack : কঠিন সমস্যা; যে লোককে সহজে টলানো যায় না;
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Appropriate Prepositions
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Lost in (মগ্ন): Simon is lost in meditation.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At home (comfortable— আরাম) He feels at home in Dhaka now.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Without fail (অবশ্যই) - You must attend the meeting without fail.